09-04-2015
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LEARN ABOUT DEBIAN
selwakeup
SELRECORD(9) BSD Kernel Developer's Manual SELRECORD(9)
NAME
selrecord, selwakeup -- record and wakeup select requests
SYNOPSIS
#include <sys/param.h>
#include <sys/selinfo.h>
void
selrecord(struct thread *td, struct selinfo *sip);
void
selwakeup(struct selinfo *sip);
DESCRIPTION
selrecord() and selwakeup() are the two central functions used by select(2), poll(2) and the objects that are being selected on. They handle
the task of recording which threads are waiting on which objects and the waking of the proper threads when an event of interest occurs on an
object.
selrecord() records that the calling thread is interested in events related to a given object. If another thread is already waiting on the
object a collision will be flagged in sip which will be later dealt with by selwakeup().
selrecord() acquires and releases sellock.
selwakeup() is called by the underlying object handling code in order to notify any waiting threads that an event of interest has occurred.
If a collision has occurred, selwakeup() will increment nselcoll, and broadcast on the global cv in order to wake all waiting threads so that
they can handle it. If the thread waiting on the object is not currently sleeping or the wait channel is not selwait, selwakeup() will clear
the TDF_SELECT flag which should be noted by select(2) and poll(2) when they wake up.
The contents of *sip must be zeroed, such as by softc initialization, before any call to selrecord() or selwakeup(), otherwise a panic may
occur. selwakeup() acquires and releases sellock and may acquire and release sched_lock.
SEE ALSO
poll(2), select(2)
AUTHORS
This manual page was written by Chad David <davidc@FreeBSD.org> and Alfred Perlstein <alfred@FreeBSD.org>.
BSD
June 13, 2007 BSD